Electric-arc lamp



(No Model.)

' I L. DAFT.

ELECTRIC ARC LAMP. No. 276.565. Patented May 1,1883.

J'gure 1.

QZMZM (I UNITED STATES PATENT OFFICE.

LEO DAFT, OF Gill!) ENYILLE, NEW JERSEY.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letter Application tiled August 12,1882.

To all whom it may concern Beit known that I, LEO DAFT, a resident of Greenville, State of New Jersey, and a citi= zen of Great Britain, have invented anew and useful Improvementin Electric Lamps or Regulators, of which the following is a i'ull, true, and exact description, reference being bad to the accompanying drawings,

Myinvention relates to an improved means of regulating each lamp in a series independently of the others, and is designed to accomplish the same result as the supplemental regulating-helix in ordinary use. My invention is shown as applied to a modification of thelamp for which 1 have previously made application on the 13th day of February, 1882. In this lamp my improved automatic regulator takes the place of the supplemental regulating-coil shown in my other arrangement.

By my improvement a certain amount of the magnetizing-helix is short-circuited orshunted out of the controllingcurrent whenever the carbons become too widely separated, thereby preventing any further separation of the carbons.

Myinvention will be readily understood from the accompanying drawings, in which Figure 1 is asectional elevation of my improved regulating apparatus. Fig. 2 is a detached scetional View, showing one of the connections; and Fig. 3 is a perspective view of the clutch device.

A represents the usual attracting coil B, the hollow core; 0, the carbonholder, held by the clutches described in my previous application.

D represents a. sliding contact, preferably a spring-contact, which is carried by but insulated from the core B, and is arranged to make contact with the plates a, b, c, d, c, and fin succession as it is moved upward. These plates are shown arranged upon an insulating-support, E. These plates are connected successively with the coils of the magnet A. A detail of the method of connecting is shown in Fig. 2, in which the plate a is shown connect ed by the wireg, passingthrough the coil-cover h to the outer coil, a, of the coil A. The plate I) is similarly connected with the nextinterior coil, and so on through the series. Now, it will be obvious that, in order that the magnet A exert its entire force, the electric current must s Fatent No. 276,565, dated May 1, 1883,

(No model.)

passthrough all its coils. This will be the case when the core B has so fardropped as that the spring D is clear of the plate I). As,however, the attraction moves the core B upward, the spring 1) comes in contact with the'plate 7), thereby shunting out the outer coil A, and preventing the further upward movement of the core, at the same time reducing the magnetic effect ofthe coil A, andlessening thetendency of the magnetic clamps l) to clutch the carbon-holder G. if the core B continues to rise, it will gradually shunt out all the coils A,

and thereby prevent any magnetic intlucnce upon the core B. I have shown all the coils of A connected with independcntplates; but this would probably not be necessary. Neither is it essential that each coil should be independently connected, for the plates to, b, c, (l, c, and f might be connected at any part of the wire of the coil A, provided that the upward movement of the core shunted out a continually-increasing section of the wire of the coil A. I have also shown anangle between the conductlug-plates and the spring D greater than is necessary in practice.

The method of supporting the carbon-holder is also new in this lamp, and it is operated directly by the movement of the axial magnet, whose movement is controlled by the regulating device heretofore described. The carbonholder in this apparatus is held by two eccentric or cam frictionclutches, which are so contrived that when the core is elevated from a rest-stop the cams act against the carbon hold er and raise it or hold itin positiomwhile when the core is dropped the cams come in contact with the rest-stop referred to and the carbonholdcr is released, thereby allowing the re-establishment or shortening of the arc. Attached to the lower end ot' the carbon-holder are two vibratable lifting-links, k, pivoted to the carbon-holder at l, and to vibrating rods m at a. At the opposite ends 0t therodsm from the pivots a are attached two came, p p. These cams are fixed to the ends of the rodsm,which turn at right angles and are supported in a frame, as shown, rectangularincontiguration, which is marked r. The'cams are so attached to the rods m that when the ends ofthe rods m which are attached to the links are depressed the surfaces of the cams are withdrawn from the carbon-holder; but when the link ends of the rods m are raised the cam-surfaces are forced together and against the carbon-holder c. The angle of the link at to the frame 7' therefore determines the grip of the cams.

The operation of the apparatus will be readily understood from the drawings. Supposing the apparatus to be in the condition shown, and the current to pass through the coil, thereby tending to raise the axial magnet B, by this movement of the axial magnet the links is will be raised, thereby lifting the free or link ends of the rods m, and causing the cams p to engage with and lift the carbon-holder c. If, however, the currentthrough thehelix a should be interrupted, or from any other cause the axial magnet B should drop, the frame 1' will come in contact with the adjustable screws a, and will thereby be raised, so that the rods on will form a different angle with the frame. Thereby the cam-surfaces of the camsp will be withdrawn from contact with the carbon-holder, and the carbon-holder allowed to drop, thus ire-establishing the circuit or shortening the are, as the case may be.

It is plain that my mechanical arrangement might be varied in many ways without altering the principle of my invention, which consists in shunting out a part of the attractingcoil of a regulator-lamp by means of apparatus controlled by the upward movementot' the core.

What I claim as myinvention, and desire to secure by Letters Patent, is-

1. The combination, in an electric lamp, of

amovable core orarmature, an attracting magnetic coil, and mechanism moving with the core or armature and operating a shunting apparatus connecting with the coil to shunt out successive sections of the coil A, and thus de crease the attractive effect of the coil as the core orarniature enters orapproaches said coil, substantially as described.

2. The combination of the coil A, the core 13, the spring D, and the shunt-connection shown, for the purpose of reducing the magnetism in the coil A on the movement of the core 1) by shunting out successive sections of. the coil, substantially as described.

3. A carbon-holder clutch for an electric lamp, which consists of twolinksflt' 7., two horizontal levers, 1' connected to two cains,p 1;,

said cams being located at the opposite side of a carbon-holder from their respective controlling-links k 70, the said cams being supported in frame at, resting upon the adjusting-screws a a, substantially as described.

4:. The combination of a carbon-holder, a core, and an eccentric cam-clutch operated by the core, with a shunting apparatus connected with the main coil of the electro-magnet, for the purpose of decreasing the attractive effect of the coil on the core as the latter enters said coil, substantially as described.

Witnesses:

Geo. H. Evans, Wu. A. Pontoon. 

